'use strict';

var nconf = require('nconf');

var plugins = require('../plugins');
var translator = require('../../public/src/modules/translator');

module.exports = function(middleware) {

	middleware.processRender = function(req, res, next) {
		// res.render post-processing, modified from here: https://gist.github.com/mrlannigan/5051687
		var render = res.render;
		res.render = function(template, options, fn) {
			var self = this;
			var req = this.req;
			var defaultFn = function(err, str) {
				if (err) {
					return next(err);
				}

				self.send(str);
			};

			options = options || {};
			if ('function' === typeof options) {
				fn = options;
				options = {};
			}

			plugins.fireHook('filter:' + template + '.build', {req: req, res: res, templateData: options}, function(err, data) {
				if (err) {
					return next(err);
				}

				options = data.templateData;

				options.loggedIn = !!req.uid;
				options.relative_path = nconf.get('relative_path');
				options.template = {name: template};
				options.template[template] = true;
				options.bodyClass = buildBodyClass(req);

				res.locals.template = template;
				options._locals = undefined;

				if (res.locals.isAPI) {
					if (req.route && req.route.path === '/api/') {
						options.title = '[[pages:home]]';
					}

					return res.json(options);
				}

				if ('function' !== typeof fn) {
					fn = defaultFn;
				}

				var ajaxifyData = JSON.stringify(options);
				ajaxifyData = ajaxifyData.replace(/<\//g, '<\\/');

				render.call(self, template, options, function(err, str) {
					if (err) {
						return fn(err);
					}

					str = (res.locals.postHeader ? res.locals.postHeader : '') + str + (res.locals.preFooter ? res.locals.preFooter : '');

					if (res.locals.footer) {
						str = str + res.locals.footer;
					} else if (res.locals.adminFooter) {
						str = str + res.locals.adminFooter;
					}

					if (res.locals.renderHeader || res.locals.renderAdminHeader) {
						var method = res.locals.renderHeader ? middleware.renderHeader : middleware.admin.renderHeader;
						method(req, res, options, function(err, template) {
							if (err) {
								return fn(err);
							}
							str = template + str;
							var language = res.locals.config ? res.locals.config.userLang || 'en_GB' : 'en_GB';
							language = req.query.lang || language;
							translator.translate(str, language, function(translated) {
								translated = translator.unescape(translated);
								translated = translated + '<script id="ajaxify-data" type="application/json">' + ajaxifyData + '</script>';
								fn(err, translated);
							});
						});
					} else {
						str = str + '<script id="ajaxify-data" type="application/json">' + ajaxifyData + '</script>';
						fn(err, str);
					}
				});
			});
		};

		next();
	};

	function buildBodyClass(req) {
		var clean = req.path.replace(/^\/api/, '').replace(/^\/|\/$/g, '');
		var parts = clean.split('/').slice(0, 3);
		parts.forEach(function(p, index) {
			parts[index] = index ? parts[0] + '-' + p : 'page-' + (p || 'home');
		});
		return parts.join(' ');
	}

};
